Galaxies are gravitationally bound, large-scale astrophysical systems composed primarily of dark matter, stars, stellar remnants, gas, and dust, often embedded in extended dark matter halos. They exhibit diverse morphologies, including spiral, elliptical, and irregular types, and span mass scales from roughly 10⁷ to over 10¹² solar masses. Their internal dynamics are governed by gravity and angular momentum distribution, with baryonic components organized into disks, bulges, and halos, and frequently hosting central supermassive black holes. Galaxies are fundamental units of cosmic structure formation, participating in hierarchical assembly, mergers, and interactions within larger environments such as groups, clusters, and filaments of the cosmic web.
To learn more about the deepest reaches of our own galaxy and the mysteries of star formation, Japanese researchers have created a deep learning model. The Osaka Metropolitan University-led team used artificial intelligence ...
Astronomy
Mar 17, 2025
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A discovery made by a team led by researchers at the University of Michigan tugs at the seams of some key cosmic lessons we thought we had learned from our own galaxy.
Astronomy
Mar 11, 2025
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This NASA/ESA Hubble Space Telescope image of a vibrant spiral galaxy called NGC 5042 resides about 48 million light-years from Earth in the constellation Hydra (the water snake). The galaxy nicely fills the frame of this ...
Astronomy
Mar 7, 2025
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Water may have first formed 100–200 million years after the Big Bang, according to a modeling paper published in Nature Astronomy. The authors suggest that the formation of water may have occurred in the universe earlier ...
Astronomy
Mar 3, 2025
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A research team from the Yunnan Observatories of the Chinese Academy of Sciences has recently published a study in The Astrophysical Journal that examines the inner and outer broad-line regions (BLRs) of active galactic nuclei ...
Astronomy
Feb 25, 2025
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Using early data from the Dark Energy Spectroscopic Instrument (DESI), a team of scientists have compiled the largest sample ever of dwarf galaxies that host an actively feeding black hole, as well as the most extensive collection ...
Astronomy
Feb 19, 2025
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Kokoro Hosogi, a physics student at The University of Alabama in Huntsville (UAH), has achieved a rare honor for an undergraduate: her contributions are being recognized in a study published in the journal Nature. The researcher ...
Astronomy
Feb 12, 2025
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An international team of researchers has found dark matter dominating the halos of two supermassive black holes in galaxies roughly 13 billion light years away. Their study, published in The Astrophysical Journal, gives new ...
Astronomy
Feb 7, 2025
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Matter in intergalactic space is distributed in a vast network of interconnected filamentary structures, collectively referred to as the cosmic web. With hundreds of hours of observations, an international team of researchers ...
Astronomy
Feb 5, 2025
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NASA's Hubble Space Telescope has captured a cosmic bullseye. The gargantuan galaxy LEDA 1313424 is rippling with nine star-filled rings after an "arrow"—a far smaller blue dwarf galaxy—shot through its heart. Astronomers ...
Astronomy
Feb 4, 2025
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